anonymous
  • anonymous
Can someone help me on a few questions?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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Baby_Bear69
  • Baby_Bear69
I can try. What are they?
anonymous
  • anonymous
there is two questions that say evaluate. I have to upload the image though
anonymous
  • anonymous
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Baby_Bear69
  • Baby_Bear69
oh lawd, I seen this in my textbook this year but I haven't learnt it yet, sorry :/
anonymous
  • anonymous
oh okay well thanks for looking at it :/
Nnesha
  • Nnesha
what is the question ? like what we have to do with that ?
anonymous
  • anonymous
I have no clue on how to do the question. It just say evaluate then the image i posted.
Nnesha
  • Nnesha
|dw:1439566610288:dw|
Nnesha
  • Nnesha
|dw:1439566827777:dw| there are total 7 term start from 1 a number which is raising to the power is ration
Nnesha
  • Nnesha
so replace n by 2 to find 2nd term 3 to find 3rd term untill 7
Nnesha
  • Nnesha
|dw:1439566934306:dw|
Nnesha
  • Nnesha
we just need that circle part n= terms that you have to find starting from 1 to 7 here i plugin 2 to find 2nd term \[\huge\rm 2(-2)^{\color{red}{2}-1}\] like this now solve
anonymous
  • anonymous
would it be -4?
Nnesha
  • Nnesha
yes right !
anonymous
  • anonymous
so i just keep plugging number in till i get to 7? Or could i just skip to 7?
Nnesha
  • Nnesha
wait a sec let me solve it first been a year haven't done question like this :/
Nnesha
  • Nnesha
you have to find all terms then add them.
Nnesha
  • Nnesha
we have to evaluate if it say find sum then we can use the formula.
dinamix
  • dinamix
Nnesha its not function like power series right ?
Nnesha
  • Nnesha
wait doesn't matter you will get the same answer no need to find all terms
dinamix
  • dinamix
its just total numbers i think
Nnesha
  • Nnesha
\[\huge\rm S_n = \frac{ a_1(1-r^n )}{ 1-r }\] use this formula plug in the r and n values then sovle
Nnesha
  • Nnesha
a_1= first term r= ratio n= number of total terms!
Nnesha
  • Nnesha
yeah sum of all 7 terms but we can use that formula to find sum of 7 terms that way we don't have to find 3,4,5,6,7 terms
anonymous
  • anonymous
so i could do it either way and get the same answer?
Nnesha
  • Nnesha
yes right
anonymous
  • anonymous
okay thank you!!
Nnesha
  • Nnesha
my pleasure!

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